Dielectric strength refers to the ratio of the breakdown voltage to the thickness of the breakdown sample, which is equal to the electrical strength of the sample. In physics, the term electrical strength has the following meaning: in insulating materials, the maximum electric field that a pure material can withstand under ideal conditions without damage (i.e., without experiencing failure of its insulation performance). For the specific configuration of dielectric materials and electrodes, the minimum applied electric field that leads to breakdown (i.e., the applied voltage divided by the electrode separation distance). The theoretical electrical strength of materials is an inherent property of bulk materials and is independent of the construction of the material or electrode applying an electric field. This' intrinsic dielectric strength 'corresponds to values measured using pure substances under ideal laboratory conditions. During breakdown, the electric field releases bound electrons. If the applied electric field is high enough, free electrons from background radiation may accelerate to the speed at which additional electrons are released during collisions with neutral atoms or molecules in a process known as avalanche breakdown. The breakdown occurs quite suddenly (usually within a few nanoseconds), leading to the formation of conductive paths and destructive discharges through the material. For solid materials, the breakdown event is severely reduced, even damaging their insulation capacity